Sanya Richards-Ross is returning to the Olympics, but not as an athlete -- her pajama/loungewear line will help keep Team USA nice and cozy in Paris ... and she tells TMZ Sports she's hoping to catch the country's biggest stars like LeBron James and Simone Biles wearing her gear!!

Marriage and running a business together can be a tough combination ... but the Rosses -- who got married in 2010 -- said it works for them because of their great foundation and recognizing each other's strengths and weaknesses ... as well as their own.

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